Carbureter.



RQW. GALLAGHER. GARBURBTER.

APPLICATION FILED NOV. 10, 1909.

976,258, Patented N0vj22; 1910.

, 2 snngcrs -siin'm 1 F/ v WITNESSES ATTORNEY a R. W. GALLAGHER.GARBURETER. APPLICATION FILED NOV. 10, 1909.

976,258 Patented Nov. 22, 1910.

2 SHEETS-SHEET Z.

I 1 g v 0 a 20 as v I g I g I 3 M p a: a 3| l4- if I wnmzsss.

- INVENTOR, m4 g jw ATTORNEY sail RIGHARDMILLIAM GALLAGHER,

,Ar onion.

F LOS ANGELES, CALIFORNIA, ASSIGNOR T0 G. 80 H.

MANUFACTURING COMPANY; OF JERSEY CITY, NEW JERSEY.

GARBURETER.

Application filed November 10, 1909. Serial No. 527,227.

specification.

Thisinvention relates to carbureters for gasolene engines and theobjectsof the invention are to provide acarbureter of such constructionthat it will" always supply a given volume of the mixture of gas and airfor a given posit-ion of the throttle lever; second, one in which theratio of the mixture may be varied as may be-desired; third, of suchconstruction as to permit the engine to be started with the throttle-practically closed thereby preventing the engine racing innuediatelyafter starting; fourth, to provide, in such a carburetor, 1neans. 'forflushing the carburetor w-ith 'gasolene, having no connection with thefloat, so that the accurate actionof the float may not be impaired byoperating said flushing means; fifth, to provide means for thoroughly'inixing the gas and air' before supplying it to the engine, therebyinsuring a more steady suction from the nozzles; sixth, to provide meansfor varying the normal level of the gasolene in the .float chamber;seventh, to provide a construction of float valve by which the float canpositively close the same. I

In the accompanying drawing, Figure 1 is a side view of the carburetor;Fig. 2 a transverse section on the line 2-2 of Fig. 3; Fig. 3 is'alongitudinal section on the line 3--3 of Fig. 1 Fig. 4is a plan viewFigxl') is a longitudinal section on the line 55 of Fig. 4; Fig. 6 is aperspective view of the air slide valve.

Referring to the drawing, 1 indicates the casing of a float chamber 2, 3indicates a float valvecasing and at a connection between them.

5 indicatesa cylindrical casing of a mix ing chamber 6 having asubstantially cylin-. drical downward:extension 7, fbrming a fixed airsupply-chamber 8. i

10 indicates a reservoir or mixing dome, and 11 a passage bet-ween thereservoir and mixing chamber. Said dome is formed with a horizontalcircular flange 12 by which the carburetor can be secured in the properpoforce the valve. to its seat to sition relative to the engine, andwith a circular depending flange 18 to which is secured the upper edgeof the float chamber. Into the lower end of the valve casing 3 isscrewed a small T-shaped casting 14 formed with a vertical bore 15, itslower end being adapted to'be connected with a pipe for. supplyinggasolene to the carbureter, and its upper end being formed into a valveseat 17. Said casting is also formed with a lateral apertured extension18 to which is connected a tube 19 leading to a small valve casing 20screwed 'into the side of the reservoir, and adapted to be closed by aneedle valve 21. The object of this tube and needle valve is to enablegasolene to be admitted direct, when desired, to the reservoir or mixingdome to flush said ervoir, thus making the engine easy to start at alltimes. lvlorcm'cla'an important advantage ot' this independent gasoleneflushing attachment is that it is no longer necessary to provide aconnection with the float, but the latter can now be free. It isnecessary with most. carbnreters to provide means, connected with thefloat, for opening the valve of thb gasolene supply, when necessary toobtain an initial supply of gasolene vapor to start the engine. Such aconnection impairs'the accurate action of the float; so that it is veryliable to need adjustment, which is not an easy matter after it isoii'ceout of order. By interposing the mixing dome between the mixing chamberand the engine, a very steady suction is created, which. in turn, causesthe air and gasolene vapor to be'well and thoroughly mixed, so that. theengine runs smoothly and steadily.

The "valve seat 17 is adapted to be closed by a main supply valve 22which is screwed within a sleeve 23, which sleeve extends through acollar 24 screwed into the upper end of the casing 3, and the sleeve-hasa. shoulder 25 adapted 'to abut against the lower:

.end of the collar to limit the upward move-- ment ofthe sleeve. Saidvalve 22 has a stem 26 extending upward through the end of said sleeve,and carrying at its upper end a head 27, by which said valve can be,conveniently screwed in said sleeve for ad ust-1 ment, said stem 26being threaded at its up per end, and a nut 28 being screwed on saidthreaded end for the purpose of locking said stem in the position towhich it is adjusted within the sleeve. Said sleeve is formed near itslower end with a circumferential groove 52.) which is engaged by the endof a lever 30 pivoted on a cross pin 31, the other end of said levercarrying a float 32 within the float chamber. lly reason of the groove2%), the valve is not only raised from its seat when the float falls,but is also forced down on to its seat when the float rises, instead ofmerelv finding its seat by its own weight.

B the above arrangement. the level of the gasolene in the float chamberis maintained constant, as, when the float rises to a certainpre-determined level, the valve 22 is closed, and when it falls belowsaid level the valve is opened to admit-more gasolene. Moreover, thislevel can be varied by adjusting the valve within the sleeve :23.

From the bottom of the float chamber a pipe 33 leads to a small casting34C screwed into the extension .7, said casting 34 being formed with'avertically extending gasolene conduit 35. Said gasolene conduitterminates at its upper end in two 'alve seats 3t), 37, of which-theseat 36 is adapted to be closed from below by a set valve 38 screwedthrough the lower portion of said casting H and extending upward in saidconduit, while the other valve seat 37 is adapted to be closed fromabove by a downwardly extending gasolene throttle valve 219 screwedthrough a sleeve -lt), which itself is l'ormed on the outside withrelatively coarse threads, and is screwed through a bearing 41 therefor,formed upon the evlindrical casting 5 of the mixing chamber. The lower'alve 38 is al ways open, and is provided with a suitable head 42 bywhich it can be adjusted by hand so that a sutlicient amount of gasolcnewill flow past the valve seat 3t; into the mixing chamber to start theengine, but said set valve does not furnish gasolene for the regularrunning of the engine a t'ter it has been started, the gasolene forregular running be-' ing admitted by the gasolene throttle valve 39.Said valve 35) is also provided with a head 59, by which it can beturned withinthe sleeve 40, but it does not turn normally therein, butonly for the purpose of adjust- Inent, being locked in its adjustedposition in the sleeve by a lock nut 43. By loosening the lock nut, the.valve may be adjusted by screwing it up or down in the sleeve 40. Thevalve 39 is opened or closed by the turning of the threaded sleeve 40within the in ternally threaded bearing 41, and this turn- .ing iseffected by means of a slotted rockarm 44 secured to the sleeve, and inthe slot of which arm is adjustably secured a bolt 45 which itself issecured to the end of a link 46 the end of which passes sl'idablythrough a block 47 which is revolubly mounted upon an arm 48 extendingobliquely upv ard from a stem 49 having a forked end to enable it to besuitably connected to a throttle lever, not shown. Thus, by the movementof the rock arm, the sleeve 40 is turned, and therefore also, on accountof its threaded engagementlindrical shell or air valve 51, which isformed with upper and lower longitudinal slots 52. 5 of such length asto permit said valve 51 to move through its full stroke 211- ,though thevalve 39 extends diametrically across the valve 51.

' The lower chamber 8 is formed with an air port which is always open toadmit air to said lower chamber, and thence thrtmgh the slot So in thevalve to the mixing chamber. The air thus admitted is sutticient formixture with the gasolene. The cutaway portion 67 is made sutlicientlydeep, as shown in Fig. 2-5,. that its inner edge is, even when the valve51 is closed, slightly beyond or inside the outer edge of the passage 11leading to the reservoir or mixing dome 10. Thus, even when the valve 51is closed and the gasolene throttle valve 39 for the gasoleno is shutoil, a narrow opening is left to! the passage of a limited quantity oft-ommingled air and gasolene vapor, ad-

mitted respectively througlrtlie port 55 and valve seat ll for startingthe engine. As the shell 51 slides outward, 'the sleeve 40 is turned toopen the valve 39, admitting gasolene past the valveseat 37 into themixing chamber. To admit air to mingle therewith. the sideo t"--themixing chamber is formed with an air port 58, which in form is anisosceles triangle, having its apex close to the closed head (30 of themixing chamber and its base remote therefrom. As the hollow valve. iswithdrawn from the closed head, more and more of said opening isuncovered. admitting more and more, as may he desired, of the air intothe mixing chamher. The air thus admitted and mixed with the vapor-ofgasolene admitted through the valve seat 237 flows by the cutawayportion (37 of the valve-51 and by the passage 11 to the mixing dome orreservoir 10, and from the reservoir 10 the mixture enters the indnctionpipes, not shown, by which it is conducted to the engine cylinder orcylinders.

The link 46 has a head 64 which bearsjusting the end of the link 46 onthe slotted arm 44;, thedesired ratio of amplitude of movement of thevalve 39 to that of the valve 51 may be secured.

has been started, the

- After the engme gasolene throttle valve is opened to admit moregasolene, and at the sametime the air valve is opened to a correspondingextent to produce the requisite mixture. Gasolene will now enter almostentirely through the gasolene throttle valve, although the set valve isalso open. This is due to the'""'fact that the conical endof thethrottle valve points downward in its seat, whereas the conical end ofthe set valve points upward. This'arrangement causes the suction aroundthe conical end of the gasolene throttle valve to increase downward,whereas that around the conical end of the set valve decreases downward.Hence the'suction from the engine on the gasolene in; the gasolenethrottle valve is greatly increased, whereas that in the set valve isgreatly decreased.

The following advantages arise from the above described provision of theset and gasolene throttle valves. be started with thegasolene throttlevalve practically closed, which prevents the engineracing immediatelyafter starting, as is the case with most other carbureters. On accountof the form of the air port at the side' of the mixing chamber, theamount of air admitted therethrough is at all times substantiallyproportioned to the gasolene admitted by the gasolene throttle valve,

however wide the latter may be opened, thus giving aperfect mixture atall positions of the throttle. At the same time, the means for admittingthe gasolene are adjustable to give any quality of mixture desired,regardless of the condition of the atmosphere. Again, since only a givenvolume of mixture will enter the engine at a fixed position of thethrottle, regardless of the momentum of the engine, the engine will notrace when theclutch is released.

I claim 2- 1. In a carbureter, a float chamber, a float therein, a valvefor admitting gasolene to the float chamber, an operative connectionbetween said float and valve to maintain said float at a uniform level,a mixing chamber for mixing air and gasolene vapor, a valve .5

for admitting gasolene from the floatcham her to the mixing chamber, amixture reser- ,voir, connected with said mixing chamber,

andlhaving an openingthrough which the The englne may V engine can besupplied, and means, inde pendent of said mixing chamber, for flushingthe reservoir with gasolene, substantially as described.

2. A float chamber, a float therein, valve means, controlled by thefloat, for admitting gasolene to the float chamber, a cylindricalhorizontal mixing chamber at one side of the float chamber, a reservoirabove the float v chamber communicating with the mixing chamber, agasolene passage from the float chamber to the mixing chamber, anadjustable set valve, an opening of variable size between the gasolenepassage and the mixing chamber, a throttle valve extending through themixing chamber for controlling admission of gasoleneto the mixinchamber, the mixing chamber having a si e opening for air admission andalso an opening in the bottom, the latter being always open, a valve inthe mixing chamber for regulating the side air admission opening andadmission of mixture'to the reservoir, a sleeve threaded in the casingof the mixing chamber, said throttle valve having its stem screwed inthe sleeve, an arm clamped to the sleeve, a link adjustably attached tothe arm, a stem on the air valve, and means connecting the air valvestem and link permitting a limited relative movement, substantially asdescribed.

3. A float chamber, a float therein, valve means, controlled by thefloat, for admitting gasolene to the float. chamber, a cylindricalhorizontal mixing chamber at one side of the float chamber, a reservoirabove the float chamber communicating with the mixing chamber, agasolene passage from the float chamber to themiXing chamber, anadjustable set valve giving an opening of variable size between thegasolene passage and the mixing chamber, a throttle valve extendingthrough the mixing chamber for controlling admission of gasolene to themixing chamber, the mixing chamber having aside opening for airadmission and also an opening in the bottom, the latter being alwaysopen, a valve in the mixing chamber for regulating the side airadmission opening and admission of mixture to the reservoir, an armattached to the air valve stem, a block journaled in the end of saidarm, a link passing through the block and having a head, and a coiledspring bearing against the block and secured to the link, substantiallyas described.

In testimony whereof'l have hereunto set my hand in the presence of twosubscribing witnesses. 1

RICHARD WILLIAM GALLAGHER.

VVitnessesz- JOHN KEATING, FRANCES G. THo n

